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Key Considerations: The neurotoxic effects of high-dose Vitamin B12 on the optic nerve
Main clinical features of vitamin B12 (cobalamin) deficiency [1,2,5] In industrialized countries, disorders such as nutritional deficiencies, malabsorption or genetic cobalamin disorders are rare or exceptional etiologies of vitamin B12 deficiency, especially in adults [5]

Doctors have found that Rifampicin, an antibiotic that treats the symptoms of tuberculosis, can lead to abnormal bleeding, greater pain and cramping, increased time between menstrual cycles, and the absence of periods for a short length of time

EFSA Journal 2026
